minix/lib/libc/arch/vax/gen/fpclassifyf.c

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/* $NetBSD: fpclassifyf.c,v 1.3 2008/04/28 20:22:57 martin Exp $ */
/*-
* Copyright (c) 2004 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Klaus Klein.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: fpclassifyf.c,v 1.3 2008/04/28 20:22:57 martin Exp $");
#endif
#include <machine/vaxfp.h>
#include <math.h>
/*
* 7.12.3.1 fpclassify - classify real floating type
* VAX F_floating version
*
* Implementation notes:
* Reserved operand -> FP_ROP
* True zero -> FP_ZERO
* Dirty zero -> FP_DIRTY_ZERO
* Finite -> FP_NORMAL
*/
int
__fpclassifyf(float x)
{
union vax_ffloating_u u;
u.ffltu_f = x;
if (u.ffltu_fflt.fflt_exp == 0) {
if (u.ffltu_fflt.fflt_sign != 0)
return FP_ROP;
else if (u.ffltu_fflt.fflt_frach != 0 ||
u.ffltu_fflt.fflt_fracl != 0)
return FP_DIRTYZERO;
else
return FP_ZERO;
} else {
return FP_NORMAL;
}
}